I'll be happy to switch to another tool if one requiring less actions exists.

I noticed that my likelihood/probability to use any tool (all other things being equal) is more or less proportional to:

P = 1 / a^2

where a is the number of required actions/user inputs. If the number of required actions is doubled, the likelihood to use the tool is divided by 4!

What about security?

There's no security, so everyone who has the URL can download your last file (well, not if you downloaded it, because then it will be automatically deleted on server). Why? Because sometimes you just want a quick solution for non-sensitive/personal data, rather than a super secure solution that would take 2 minutes (go to Gmail on phone, enter login, enter password, upload file, go to Gmail on computer, enter login, enter password, download the file...)